Passing -I<path> results in non-canonicalized path in $LOAD_PATH #6415

Environment Information

Provide at least:

• JRuby version (jruby -v) and command line (flags, JRUBY_OPTS, etc):
  jruby 9.2.13.0 (2.5.7) 2020-08-03 9a89c94 OpenJDK 64-Bit Server VM 25.265-b01 on 1.8.0_265-b01 +jit [linux-x86_64]

• Operating system and platform (e.g. uname -a):
  Linux 2a7b0b32d7b2 4.9.125-linuxkit break script engine #1 SMP Fri Sep 7 08:20:28 UTC 2018 x86_64 GNU/Linux

Expected Behavior

$ ruby -v
ruby 2.8.0dev (2020-07-16T02:49:09Z master 1fb4e28002) [x86_64-linux]

$ ruby -Ilib:test -e 'p $LOAD_PATH.grep(/^lib/)'
[]

Actual Behavior

$ ruby -v
jruby 9.2.13.0 (2.5.7) 2020-08-03 9a89c94bcc OpenJDK 64-Bit Server VM 25.265-b01 on 1.8.0_265-b01 +jit [linux-x86_64]

$ ruby -Ilib:test -e 'p $LOAD_PATH.grep(/^lib/)'
["lib"]